谷歌地图API第3版加载JSON数据 [英] Load JSON data for Google MAPS API v3

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本文介绍了谷歌地图API第3版加载JSON数据的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

从下面的例子中code开始(从的https://google-developers.appspot.com/maps/documentation/javascript/overlays#SimpleIcons)

 <!DOCTYPE HTML>
< HTML和GT;
  < HEAD>
    < META NAME =视CONTENT =初始规模= 1.0,用户可扩展性=无/>
    <风格类型=文/ CSS>
      HTML {身高:100%}
      车身高度{:100%;保证金:0;填充:0}
      #map_canvas {身高:100%}
    < /风格>
    <脚本类型=文/ JavaScript的
      src=\"http://maps.googleapis.com/maps/api/js?key=AIzaSyCHgCs40BzMLmN2-GpJ-liYfcYsas-VVsI&sensor=false\">
    < / SCRIPT>
    <脚本类型=文/ JavaScript的>
函数初始化(){
  VAR的MapOptions = {
    变焦:10,
    MAXZOOM:12,
    中心:新google.maps.LatLng(-33.9,151.2),
    mapTypeId设为:google.maps.MapTypeId.ROADMAP
  }
  VAR地图=新google.maps.Map(的document.getElementById(map_canvas的)
                                的MapOptions);  setMarkers(地图,海滩);
}/ **
 *数据由名称,的经纬度,并为zIndex的标记
 *在这些标记物应显示各顶部的顺序
 *等。
 * / VAR的沙滩=(函数(){
    VAR JSON = NULL;
    $阿贾克斯({
        异步:假的,
        全球性:假的,
        URL:data.php,
        的dataType:JSON
        '成功':功能(数据){
            JSON =数据;
        }
    });
    返回JSON;
    警报(OK,加载的数据);
});/ * VAR的沙滩= [
  ['斯图加特',48.766700,9.183330,4]
  ['Coogee海滩,-33.923036,151.259052 5]
  ['克罗纳拉海滩,-34.028249,151.157507,3]
  ['曼利海滩,-33.80010128657071,151.28747820854187,2]
  ['马鲁巴海滩,-33.950198,151.259302,1]
];
* /
功能setMarkers(地图,位置){
  //添加标记到地图  //标记尺寸pssed为X,Y的尺寸前$ P $
  //在图像的原点(0,0)位于
  //在图像的左上角。  //起源,锚位置和标志的坐标
  //增加在X方向向右和
  // Y方向向下。
  VAR形象=新google.maps.MarkerImage(图像/ beachflag.png',
      //这个标记是20个像素宽32像​​素高。
      新为google.maps.Size(20,32),
      //该图片的原点是0,0。
      新google.maps.Point(0,0),
      //该图片的锚旗杆在0.32的基础。
      新google.maps.Point(0,32));
  VAR阴影=新google.maps.MarkerImage(图像/ beachflag_shadow.png',
      //阴影图像是在水平尺寸大
      //而位置和偏移的相同的主要图像。
      新为google.maps.Size(37,32)
      新google.maps.Point(0,0),
      新google.maps.Point(0,32));
      //定义形状的图标的可点击区域。
      //类型定义HTML<&地区GT;元素聚,这
      //描绘出一个多边形为一系列的X,Y点。最后
      //坐标通过连接到所述第一关闭聚
      //坐标。
  VAR形状= {
      坐标:[1,1,1,20,18,20,18,1],
      类型:'聚'
  };
  对于(VAR I = 0; I< locations.length;我++){
    VAR沙滩=位置[I]
    VAR myLatLng =新google.maps.LatLng(海滨[1],海滨[2]);
    VAR的标记=新google.maps.Marker({
        位置:myLatLng,
        地图:地图,
        阴影:阴影,
        图标:图像,
        外形:外形,
        标题:海滩[0]
        zIndex的:海滩[3]
    });
  }
}
    < / SCRIPT>
  < /头>
  <身体的onload =初始化()>
    < D​​IV ID =map_canvas的风格=宽度:100%;身高:100%>< / DIV>
  < /身体GT;
< / HTML>

我可以从外部文件加载点?
使用该解决方案负载JSON为可变我做了以下内容:

  VAR海滩=(函数(){
    VAR JSON = NULL;
    $阿贾克斯({
        异步:假的,
        全球性:假的,
        URL:data.json,
        的dataType:JSON
        '成功':功能(数据){
            JSON =数据;
        }
    });
    返回JSON;
})();

但文件列表的海滩似乎并没有被良好的格式化JSON文件!
文件data.json:

 海滩:
  ['邦迪海滩,-33.890542,151.274856,4]
  ['Coogee海滩,-33.923036,151.259052 5]
  ['克罗纳拉海滩,-34.028249,151.157507,3]
  ['曼利海滩,-33.80010128657071,151.28747820854187,2]
  ['马鲁巴海滩,-33.950198,151.259302,1]
];


解决方案

似乎是在澳大利亚受欢迎的活动。请参见下面的:

谷歌地图API第3版:从Excel批量上传标记的自定义信息框

starting from the following example code (from https://google-developers.appspot.com/maps/documentation/javascript/overlays#SimpleIcons)

   <!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no" />
    <style type="text/css">
      html { height: 100% }
      body { height: 100%; margin: 0; padding: 0 }
      #map_canvas { height: 100% }
    </style>
    <script type="text/javascript"
      src="http://maps.googleapis.com/maps/api/js?key=AIzaSyCHgCs40BzMLmN2-GpJ-liYfcYsas-VVsI&sensor=false">
    </script>
    <script type="text/javascript">
function initialize() {
  var mapOptions = {
    zoom: 10,
    maxZoom: 12,
    center: new google.maps.LatLng(-33.9, 151.2),
    mapTypeId: google.maps.MapTypeId.ROADMAP
  }
  var map = new google.maps.Map(document.getElementById("map_canvas"),
                                mapOptions);

  setMarkers(map, beaches);
}

/**
 * Data for the markers consisting of a name, a LatLng and a zIndex for
 * the order in which these markers should display on top of each
 * other.
 */

 var beaches = (function () {
    var json = null;
    $.ajax({
        'async': false,
        'global': false,
        'url': data.php,
        'dataType': "json",
        'success': function (data) {
            json = data;
        }
    });
    return json;
    alert("OK, data loaded");
}); 



/*var beaches = [
  ['Stuttgart', 48.766700, 9.183330, 4],
  ['Coogee Beach', -33.923036, 151.259052, 5],
  ['Cronulla Beach', -34.028249, 151.157507, 3],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
  ['Maroubra Beach', -33.950198, 151.259302, 1]
];
*/
function setMarkers(map, locations) {
  // Add markers to the map

  // Marker sizes are expressed as a Size of X,Y
  // where the origin of the image (0,0) is located
  // in the top left of the image.

  // Origins, anchor positions and coordinates of the marker
  // increase in the X direction to the right and in
  // the Y direction down.
  var image = new google.maps.MarkerImage('images/beachflag.png',
      // This marker is 20 pixels wide by 32 pixels tall.
      new google.maps.Size(20, 32),
      // The origin for this image is 0,0.
      new google.maps.Point(0,0),
      // The anchor for this image is the base of the flagpole at 0,32.
      new google.maps.Point(0, 32));
  var shadow = new google.maps.MarkerImage('images/beachflag_shadow.png',
      // The shadow image is larger in the horizontal dimension
      // while the position and offset are the same as for the main image.
      new google.maps.Size(37, 32),
      new google.maps.Point(0,0),
      new google.maps.Point(0, 32));
      // Shapes define the clickable region of the icon.
      // The type defines an HTML <area> element 'poly' which
      // traces out a polygon as a series of X,Y points. The final
      // coordinate closes the poly by connecting to the first
      // coordinate.
  var shape = {
      coord: [1, 1, 1, 20, 18, 20, 18 , 1],
      type: 'poly'
  };
  for (var i = 0; i < locations.length; i++) {
    var beach = locations[i];
    var myLatLng = new google.maps.LatLng(beach[1], beach[2]);
    var marker = new google.maps.Marker({
        position: myLatLng,
        map: map,
        shadow: shadow,
        icon: image,
        shape: shape,
        title: beach[0],
        zIndex: beach[3]
    });
  }
}
    </script>
  </head>
  <body onload="initialize()">
    <div id="map_canvas" style="width:100%; height:100%"></div>
  </body>
</html>

can I load the points from an external file? Using this solution load json into variable I made the following:

var beaches = (function () {
    var json = null;
    $.ajax({
        'async': false,
        'global': false,
        'url': data.json,
        'dataType': "json",
        'success': function (data) {
            json = data;
        }
    });
    return json;
})(); 

but the file beaches list doesn't seem to be a well formatted JSON file! file data.json:

beaches: [
  ['Bondi Beach', -33.890542, 151.274856, 4],
  ['Coogee Beach', -33.923036, 151.259052, 5],
  ['Cronulla Beach', -34.028249, 151.157507, 3],
  ['Manly Beach', -33.80010128657071, 151.28747820854187, 2],
  ['Maroubra Beach', -33.950198, 151.259302, 1]
];

解决方案

Seems to be a popular activity in Australia. See the below:

Google Maps API v3: Bulk uploading markers from Excel with custom info boxes

这篇关于谷歌地图API第3版加载JSON数据的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!

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